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The selection and use of diamond ultra-thin slices before the introduction
Apr 26, 2018

Before selecting and using the diamond ultra-thin cutting tool, the user must know the following common knowledge about the cutting knife of diamond.

1. Differences between CVD diamond coating and amorphous diamond coating.

Amorphous diamond (also known as diamond-like carbon) coating is a carbon film deposited by PVD process. It has the SP3 bond of some diamond and the SP2 bond of some carbon. The film has a high hardness, but it is lower than the hardness of diamond film. The thickness is also thinner than the diamond film we usually deposited. When processing graphite, the life of amorphous diamond coating tool is 2~3 times that of uncoated cemented carbide tool. Compared with CVD diamond is the pure diamond coating using CVD process, the processing of graphite when the knives' service life 12 ~ 20 times that of carbide cutting tools, which can decrease The Times of change and improve the reliability of machining precision and consistency.

2. It is not possible to process hardened steel with diamond tools.

Diamond is made up of carbon atoms. When some materials are heated, carbon atoms are sucked out of the diamond and carbon is formed in the workpiece. Iron is one of these materials. When using diamond tools to process iron materials, the heat generated by friction can cause the carbon atoms in the diamond to spread to the iron, thus causing the diamond coating to be invalidated in advance due to chemical wear.

3. It is difficult to guarantee the quality of diamond coated tools with heavy grinding and/or heavy coating.

Because the coating on the tool surface is pure diamond, it will take a long time to regrind the tool with diamond grinding wheel. In addition, in order to make the diamond growth and use of tools preparation technology will change the surface chemical properties, due to the coating requirements to very precise control of the chemical properties, so the cutting tool to the effect of the coating is difficult to guarantee.

4. The life of diamond coated knives is different.

As with any other tool, diamond coated tools have different life spans, depending on the cutting material, the feed rate and the cutting speed, and the geometry of the workpiece. In general, the life of diamond coated tools for processing graphite is 10 to 20 times that of uncoated cemented carbide, and may even be longer in some cases. In this way, a tool can be used to complete almost any machining task without changing the knife due to tool wear, avoiding the process interruption and recalibration, thus it is possible to realize unattended processing. In the processing of composite materials, it is also possible to obtain longer tool life. It is reported that diamond coated tools can live up to 70 times as long as uncoated carbide cutting tools in processing high-density fiberglass, carbon fiber and g10-fr4.

5. The peeling of diamond coating can be prevented.

Coating peeling is a serious problem of diamond coated tools, and it is also a common problem (especially in the processing of materials such as carbon fiber), which can lead to unpredictable tool life. In the late 1990s, the interface chemistry was identified as an important factor affecting the adhesion properties of diamond coatings. By selecting good carbide chemical compatibility features, adopt appropriate pretreatment technology and reasonable deposition reaction conditions, it is possible to reduce or eliminate the diamond coating peeling, steady smooth implementation of the wear mode. Under the microscope, the diamond coated tool with normal wear is observed, and the diamond can be found to be stable and wear down to the carbide substrate without breaking or peeling.

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